JPH10171368A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely hold a display panel which is made large in size. SOLUTION: One main surface 21a of the display panel 21 constituted by charging at least liquid crystal in a recessed part 23 of a holder 22 having the recessed part 23 of size nearly corresponding to the display panel 21 on one main surface 22a is fallen, and the main surface 21b on the opposite side is pressed with opening ends 25a and 25b of a frame 26 which has a window part 25 formed at a specific position to a size nearly corresponding to the display panel 21 and also has its opening ends 25a and 25b of the frame 26 bent along the thickness. Here, the main surface 21a of the display panel 21 and the recessed part 23 of the holder 22 are preferably adhered with an adhesive tape which has adhesive layers on bath its surfaces and is formed of acryl rubber containing glass meshes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device having a display panel in which at least liquid crystal is sealed. More specifically, the present invention relates to an image display device in which a large display panel can be sufficiently held by sandwiching and holding the display panel in a thickness direction by a holder and a frame.

[0002]

2. Description of the Related Art Unlike a cathode ray tube display device, an image display device called a flat display device having a flat shape has been actively developed in recent years. As such an image display device, a plasma display (hereinafter, referred to as a PDP) utilizing light emission from a phosphor due to ultraviolet radiation accompanying discharge, or an active element such as a transistor provided for each display pixel is provided. An image display device (hereinafter, referred to as a driving method) that drives a display panel in which liquid crystal is sealed by applying a so-called active matrix addressing method.
It is called a TFT liquid crystal display. ) Is drawing attention.

However, in the latter TFT liquid crystal display, it is necessary to provide a large number of semiconductor elements such as thin film transistors. Therefore, there is a concern about a yield problem particularly when the display is made large in area to form a large screen. There is a disadvantage that the manufacturing cost is high.

In order to solve these problems, there has been proposed an image display apparatus to which a system utilizing discharge plasma instead of a semiconductor element such as a MOS transistor or a thin film transistor is used as an active element.

In such an image display device, a plasma cell having a plurality of discharge electrodes and performing a plasma discharge, and a liquid crystal in which a second substrate having an electrode substantially orthogonal to the discharge electrodes is an electro-optical material And a display panel having a display panel which is formed by being overlapped with a liquid crystal layer formed of the liquid crystal layer.

In the plasma cell, a dielectric thin plate is disposed at a predetermined interval on a first substrate on which a plurality of discharge electrodes substantially parallel to each other are formed on one main surface. The gap between the first and second dielectric thin plates is filled with an ionizable gas, and the periphery thereof is sealed with a seal portion. In addition,
This plasma cell is divided into linear plasma chambers by partition walls, and plasma discharge is enabled in each plasma chamber.

The second substrate has an electrode substantially orthogonal to the discharge electrode of the plasma cell formed on one main surface. The second substrate has an electrode formation surface facing the plasma cell. On the dielectric thin plate via a liquid crystal layer.

In this display panel, each plasma chamber of the plasma cell is sequentially switched and scanned, and a signal voltage is applied to electrodes of a second substrate opposed to each other with a liquid crystal layer therebetween in synchronization therewith. The liquid crystal is driven, and the intersection of each plasma chamber and the electrode of the second substrate is defined as a pixel.

Further, since the above-mentioned display panel is not of a self-luminous type, in an image display device using the same,
It is necessary to use external light to display an image.
Therefore, for example, a light source called a backlight is provided on one main surface side, which is the back surface of the display panel, and light emitted from this light source is transmitted to the display panel, and transmission or blocking of light by the liquid crystal in the liquid crystal layer is used. To display images.

[0010]

However, in the above-mentioned image display device, holding the display panel is a major problem.

That is, for example, in a PDP, FIG.
As schematically shown in FIG. 1, a heat dissipation plate 102 made of, for example, aluminum or the like is adhered to one main surface 101a, which is the back surface of the display panel 101 in which the phosphor is sealed, with an epoxy-based adhesive or the like. One main surface 101a of 101
A window 103 having a size substantially corresponding to the display panel 101 is provided at a predetermined position on the one main surface 101b, which is the surface opposite to the main surface 101b.
A frame 104 whose opening ends 103a and 103b (only two directions are shown here) is bent in the thickness direction is arranged, and the opening ends 103a and 103b are on one main surface 101b side of the display panel 101. Is pressed to sandwich the display panel 101 between the frame 104 and the heat sink 102 and hold it.

The radiator plate 102 is provided with mounting bosses 105a and 105b having screw holes for a chassis, which is a holding member (not shown), so that an end (not shown) of the frame 104 can be mounted on the chassis. ing. Therefore, the frame 104, the display panel 10
1. The radiator plate 102 is attached to the chassis in a combined state, and is incorporated in the image display device main body.

Further, the display panel 101 has a chip tube 106 for introducing gas into the display panel 101.
a and 106b are also formed.

If the display panel 101 is supported in this manner, the display panel 101 can be securely fixed. However, in the above-described image display device, light emitted from the backlight is emitted. Since it is necessary to transmit light through the display panel, it is impossible to use the entire rear surface of the display panel as an adhesive surface.

In a small TFT liquid crystal display among the TFT liquid crystal displays, as shown schematically in FIG. 12, one main surface 107a serving as the back surface of the display panel 107 is provided on the front surface of a backlight 108 serving as a light source. Adhesive tapes 109a and 109b having an adhesive layer on both sides are adhered on one main surface 108a to be formed, and the display panel 107 is substantially fixed at a predetermined position on the one main surface 108b side opposite to the one main surface 108a. An upper cover lid 111 in which a window 110 of a corresponding size is formed is disposed, and this is fixed to the display panel 107 by screwing or caulking, so that the upper cover lid 111 and the backlight 108 are fixed. To hold the display panel 107 therebetween. Note that the upper lid 111 for holding may be formed of a sheet metal or the like.

However, this method is not suitable for holding a large display panel. That is, when the display panel is enlarged, the warp of the display panel itself increases, and in the above-described method, the display panel in the warped state is sandwiched between the backlight and the upper cover for holding, and the display panel is securely held. It is impossible to fix.

Further, if the display panel is adhered to the backlight as described above, it becomes difficult to replace the backlight, which is not preferable.

Accordingly, the present invention has been proposed in view of the conventional circumstances, and has as its object to provide an image display device in which a large-sized display panel is securely held.

[0019]

In order to achieve the above-mentioned object, an image display device according to the present invention comprises a display panel having at least liquid crystal sealed therein and a main surface having a size substantially corresponding to the display panel. A holder having a concave portion, a window portion having a size substantially corresponding to the display panel is formed at a predetermined position, and a frame whose opening end is bent in a thickness direction, one side of the display panel is formed in the concave portion of the holder. The main surface on the opposite side is dropped and is pressed by an opening end bent in the thickness direction of the window of the frame.

In the image display device of the present invention, one side of the display panel and the concave portion of the holder have an adhesive layer on both sides and are bonded by an adhesive tape made of acrylic rubber containing glass mesh. Is preferred.

The adhesive layer of the adhesive tape is preferably made of an acrylic adhesive.

Further, in the above-described image display device of the present invention, the display panel is provided on the first substrate having a plurality of substantially parallel discharge electrodes formed on one main surface thereof at predetermined intervals. A body thin plate is arranged, a gap between the first substrate and the dielectric thin plate is filled with an ionizable gas, and a periphery thereof is sealed with a seal portion to form a plasma cell, and a plasma cell is formed on the dielectric thin plate. Alternatively, a second substrate having an electrode substantially orthogonal to the discharge electrode formed on the facing surface may be overlapped with a liquid crystal layer interposed therebetween.

In the above-described image display device of the present invention, when a sealing tube for sealing an ionizable gas is formed in the display panel, a corresponding hole is formed in the recess of the holder. Is preferred.

An image display device according to the present invention comprises a display panel in which at least liquid crystal is sealed, a holder having a concave portion on one main surface having a size substantially corresponding to the display panel, and a display panel provided at a predetermined position. A window portion of a corresponding size is formed, the opening end of which has a frame bent in the thickness direction, one side of the display panel is dropped into the recess of the holder, and the opposite main surface is the frame. Because it is held down by the opening end bent in the thickness direction of the window,
The display panel is held down by the opening end of the window of the frame while being fitted in the concave portion of the holder. Even if the display panel is warped, it is fitted in the concave portion and fixed. The display panel is fitted in the recess of the holder and is fixed in the in-plane direction, is pressed down by the opening end of the window of the frame, is fixed in the thickness direction, and is securely in both the in-plane direction and the thickness direction. Fixed.

In the above-described image display apparatus of the present invention, if one surface of the display panel and the concave portion of the holder are adhered to each other with an adhesive tape made of acrylic rubber having a glass mesh and having an adhesive layer on both surfaces, a display is achieved. The panel is more securely fixed, and even if the display panel is warped, the elasticity of the adhesive tape absorbs the warp of the display panel, so that the display panel is more easily fixed.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the image display device of the present embodiment includes a display panel 21 in which at least liquid crystal is sealed, and a holder 22 having a concave portion 23 having a size substantially corresponding to the display panel 21 on one main surface 22a side. A window 25 having a size substantially corresponding to the display panel 21 is formed at a predetermined position.
25b (only two directions are shown here) is constituted by a frame 26 bent in the thickness direction.

In the display panel 21, as shown in FIGS. 2 and 3, drive substrates 26a and 26 for driving the peripheral portions thereof (here, three directions) are provided.
b and 26c are flexible printed wiring boards 27a and 27
b, 27c (hereinafter, referred to as FPCs 27a, 27b, 27c).

The display panel is shown in FIGS.
As shown in FIG. 1, an electro-optical display cell 1 and a plasma cell 2
Are laminated with a liquid crystal layer 7 interposed therebetween to form a flat panel structure.

The electro-optical display cell 1 has an upper glass substrate 4
(Hereinafter, referred to as a second substrate 4). On one main surface 4a inside the second substrate 4, a plurality of data electrodes 5 made of a transparent conductive material and formed in parallel lines are formed at predetermined intervals in parallel in a predetermined direction. Have been. Here, this forming direction is referred to as a column direction.

On the other hand, the plasma cell 2 is configured using a lower glass substrate 8 (hereinafter, referred to as a first substrate 8). A plasma electrode (discharge electrode) is formed on one main surface 8a inside the first substrate 8, and a plurality of anode electrodes 9A and cathode electrodes 9 formed in parallel lines are formed.
K are alternately formed in parallel in a predetermined direction at predetermined intervals to form a discharge electrode group. Here, this forming direction is referred to as a row direction.

At approximately the center of the upper surface of each of the anode electrode 9A and the cathode electrode 9K, a partition 10 having a predetermined width is formed so as to extend along the respective electrodes. The top of each partition 10 is in contact with the lower surface of the dielectric thin plate 3 so that the size of the gap between the first substrate 8 and the dielectric thin plate 3 is kept constant.

The dielectric thin plate 3 is made of thin glass or the like and functions as a capacitor by itself. Therefore, in order to sufficiently secure electrical coupling between the electro-optical display cell 1 and the plasma cell 2 and to suppress the two-dimensional spread of electric charges, the dielectric thin plate 3 needs to be as thin as possible. Is preferably, for example, about 50 μm.

The second substrate 4 of the electro-optical display cell 1
Is bonded to the dielectric thin plate 3 through a spacer 6, and a liquid crystal is filled between the second substrate 4 and the dielectric thin plate 3 to form a liquid crystal layer 7. The second substrate 4
The dimension of the gap between the substrate and the dielectric thin plate 3 is, for example, 4 to 10 μm
And is kept substantially uniform over the entire surface.

That is, the second substrate 4 is laminated on the plasma cell 2 via the liquid crystal layer 7 which is an electro-optical material layer.

A frit seal material 11 made of low-melting glass or the like is provided along the periphery of the first substrate 8 so that the first substrate 8 and the thin dielectric plate 3 are airtight. And the plasma cell 2 is configured as a closed space. An ionizable gas is sealed in a closed space, which is a gap between the first substrate 8 and the dielectric thin plate 3.
For example, helium, neon, argon, or a mixed gas thereof is used as the gas to be sealed. For this reason, in the display panel 21, as shown in FIG. 3, the gas for sealing these gases to the one main surface 21 a (here, the first substrate 8 side) serving as the back surface is used. A tip tube 28 as an encapsulation tube is provided.

As a result, the first substrate 8 and the dielectric thin plate 3
In the gaps, discharge channels 12 (plasma chambers), which are a plurality of spaces separated by each partition 10, are formed in parallel in the row direction. That is, the discharge channel 12 is formed to be orthogonal to the data electrode 5.

Accordingly, each data electrode 5 is a unit of column driving and each discharge channel 12 is a unit of row driving, and the intersection of the two corresponds to the pixel 13 as shown in FIG.

In the image display device having the above configuration, when a predetermined voltage is applied between the anode electrode 9A and the cathode electrode 9K corresponding to the predetermined discharge channel 12, the gas sealed in the discharge channel 12 is discharged. When ionized, plasma discharge occurs and is maintained at the anode potential.

In this state, when a data voltage is applied to the data electrode 5, the data voltage is applied to the liquid crystal layer 7 corresponding to the plurality of pixels 13 arranged in the column direction corresponding to the discharge channel 12 in which the plasma discharge has occurred. Is written.

When the plasma discharge ends, the discharge channel 12 becomes a floating potential, and the data voltage written in the liquid crystal layer 7 corresponding to each pixel 13 is held until the next writing period (for example, after one field or one frame). Is done. In this case, the discharge channel 12 functions as a sampling switch, and the liquid crystal layer 7 of each pixel 13 functions as a sampling capacitor.

The liquid crystal operates by the data voltage written in the liquid crystal layer 7, and display is performed in pixel units. Accordingly, by sequentially scanning the discharge channels 12 for generating the plasma discharge as described above and applying a data voltage to each data electrode 5 in synchronization with this, the liquid crystal layer 7 is driven similarly to the active matrix addressing method. Thus, a two-dimensional image can be displayed.

The holder 22 is provided as shown in FIGS.
As shown in FIG. 5, a recess 23 having a size substantially corresponding to the first substrate 8 which is the back surface of the display panel 21 is formed on one main surface 22a side, and a window portion 29 is formed on the bottom surface of the recess 23. It is a frame-shaped member to be formed.

Further, the holder 22 has a recess 23
A hole 30 corresponding to the chip tube 28 provided on the one main surface 21a side serving as the back surface of the display panel 21 is formed in the main surface 23a serving as the bottom surface of the display panel 21. In the holder 22, holes 31 for attaching to a chassis, which is a holding member to be described later, are formed at four ends thereof.

In the image display device of this embodiment,
As shown in FIG. 1, the one main surface 21 a serving as the back surface of the display panel 21, that is, the first substrate 8 is dropped into the concave portion 23 of the holder 22 and fitted, and the opposite main surface 21 b serving as the front surface, that is, The second substrate 4 is pressed by the open ends 25a and 25b of the frame 26 bent in the thickness direction of the window 25.

Further, in the image display device of this embodiment,
As shown in FIG. 9 in an enlarged manner, in the concave portion 23 of the holder 22, a portion between one main surface 21a of the display panel 21 and a main surface 23a serving as the bottom surface of the concave portion 23 has an adhesive layer on both surfaces and contains a glass mesh. Adhesive tape 3 made of acrylic rubber
2 bonded together. Note that the adhesive layer of the adhesive tape 32 is preferably formed of an acrylic adhesive. When a 25-inch image display device is to be formed, the thickness of the adhesive tape 32 is set to 1.
It is preferable to set it to about 0 mm to 2.0 mm.

Further, in the image display device of the present embodiment, as shown in an enlarged view in FIG. 9, the opening end 25b of the window 25 of the frame 26 (here, only one opening end 25b is shown).
Cushion material 33 between the display panel 21 and one main surface 21b of the display panel 21
To intervene. As the cushion material 33, a material having elasticity such as urethane resin or silicone rubber can be used.

Further, in the image display device of the present embodiment, the chip tube 28 of the display panel 21 is formed in the hole 30 formed on the main surface 23a serving as the bottom surface of the concave portion 23 of the holder 22 so as to correspond to the chip tube 28. Has been inserted.

In the image display device of this embodiment, the driving board connected to the display panel 21 is, for example, an FPC 27.
By using the flexibility of c, it is disposed by being turned around the back side of the holder 22.

As shown in FIG. 1, the image display device of this embodiment is mounted on a chassis 34 as a holding member so that the holder 22 faces the holder. The above chassis 34
As shown in FIG. 10, is a member having a substantially U-shaped cross section, and having a groove portion 35 that opens toward one main surface 34a,
In the groove 35, a backlight 36 in which a light source such as a fluorescent tube (not shown) is disposed is detachably housed. The hole 3 of the holder 22 of the chassis 34
A hole 37 for attachment is formed at a position corresponding to 1, and a hole 38 is formed at a position corresponding to the hole 30 corresponding to the chip tube 28 of the holder 22 so as to penetrate it.

That is, when the image display device of this embodiment is mounted on the chassis 34, the light emitted from the backlight 36 is applied to the display panel 21 via the window 29 of the holder 22, and the light emitted from the liquid crystal in the liquid crystal layer 7 is emitted. The image is displayed using the transmission or blocking of the image.

In the image display device of this embodiment, one main surface 21a of the display panel 21 is dropped into the concave portion 23 of the holder 22, and the opposite main surface 21b is bent in the thickness direction of the window 25 of the frame 26. The display panel 21 is pressed by the opening ends 25a, 25b of the window 25 of the frame 26 in a state of being fitted in the concave portion 23 of the holder 22, since the display panel 21 is pressed by the opened ends 25a, 25b. Is fixed in the concave portion 23 even if it is warped due to an increase in size. The display panel 21 is fitted into the concave portion 23 of the holder 22 and fixed in the in-plane direction.
a, 25b and fixed in the thickness direction,
It is securely fixed in both the in-plane direction and the thickness direction. Therefore, even if the display panel is enlarged, it is reliably held.

In the image display device of the present embodiment, one main surface 21a of the display panel 21 and the concave portion 23 of the holder 22 are provided.
Between the main surfaces 23a, which are the bottom surfaces of the display panels, are adhered by an adhesive tape 32 made of acrylic rubber containing glass mesh, and the display panel 21 is more securely fixed, and Even if the warpage occurs in the display panel 21, the elasticity of the adhesive tape 32 causes the display panel 2 to warp.
1 is more easily fixed because the warpage is absorbed.

Further, in the image display device of this embodiment, a cushion member 33 is interposed between the opening end 25b of the frame 26 and the main surface 21b of the display panel 21 (the same applies to the opening end 25a side). The damage of the display panel 21 due to the opening ends 25a and 25b of the window portion 25 of the frame 26 is prevented.

Further, in the image display device of this embodiment, the concave portion 23 is provided in the holder 22 to hold the display panel 21 and the space between them is fixed by the adhesive tape 32, so that the weight of the image display device is reduced. Can be securely held without increasing the thickness more than necessary and without increasing the thickness more than necessary.

Further, in the image display device of this embodiment, since the backlight 36 is detachably housed in the chassis 34, the replacement of the backlight 36 is easy.

When assembling the image display device of this embodiment, the display panel 21 is fixed to the holder 22 and
After the holder 22 is fixed to the chassis 34 by screws or the like, the workability is good if the frame 26 is attached to the chassis 34 with the holder 22 interposed therebetween.

[0057]

As is apparent from the above description, the image display device of the present invention has at least a display panel in which liquid crystal is sealed, and a concave portion having a size substantially corresponding to the display panel on one main surface. A holder having a window portion having a size substantially corresponding to the display panel at a predetermined position, and having a frame whose opening end is bent in the thickness direction, and one surface side of the display panel is formed in a concave portion of the holder. Since the main panel on the opposite side is dropped and held down by the opening end bent in the thickness direction of the window of the frame, the display panel is inserted into the recess of the holder and the opening end of the window of the frame is held. Therefore, even if the display panel is warped, it is fitted and fixed in the recess. The display panel is fitted in the recess of the holder and is fixed in the in-plane direction, is pressed down by the opening end of the window of the frame, is fixed in the thickness direction, and is securely in both the in-plane direction and the thickness direction. Fixed. Therefore, even if the display panel is enlarged, it is reliably held.

In the above-described image display device of the present invention, if one side of the display panel and the concave portion of the holder are adhered to each other with an adhesive tape made of acrylic rubber having a glass mesh and having an adhesive layer on both sides, a display is achieved. The panel is more securely fixed, and even if the display panel is warped, the elasticity of the adhesive tape absorbs the warp of the display panel, so that the display panel is more easily fixed.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a main part showing an image display device and a chassis to which the present invention is applied.

FIG. 2 is a plan view showing a display panel.

FIG. 3 is a side view showing a display panel.

FIG. 4 is a schematic perspective view of a main part showing a display panel in an enlarged manner.

FIG. 5 is a schematic cross-sectional view of a main part showing a display panel.

FIG. 6 is a schematic diagram showing data electrodes, plasma electrodes, and discharge channels of a display panel.

FIG. 7 is a plan view showing a holder.

FIG. 8 is a sectional view showing a holder.

FIG. 9 is an enlarged sectional view of a main part showing an image display device to which the present invention is applied.

FIG. 10 is a sectional view showing a chassis and a backlight.

FIG. 11 is a cross-sectional view schematically showing a method of holding a display panel in a PDP.

FIG. 12 is a cross-sectional view schematically showing a method of holding a display panel in a TFT liquid crystal display.

[Explanation of symbols]

2 plasma cell, 3 dielectric plate, 4 second substrate,
Reference Signs List 5 data electrode, 7 liquid crystal layer, 8 first substrate, 9A anode electrode, 9K cathode electrode, 11 frit seal material, 12 discharge channel, 13 pixels, 21 display panel, 22 holder, 23 recess, 25 window, 25
a, 25b Open end, 26 frame, 28 chip tube, 30 hole, 32 adhesive tape

Claims (4)

[Claims] 1. A display panel having at least liquid crystal sealed therein, a holder having a concave portion having a size substantially corresponding to the display panel on one main surface, and a window having a size substantially corresponding to the display panel at a predetermined position. A frame is formed, the opening end of which is bent in the thickness direction. One side of the display panel is dropped into the recess of the holder, and the opposite main surface is bent in the thickness direction of the window of the frame. An image display device characterized by being held down by an open end. 2. The display device according to claim 1, wherein one side of the display panel and the concave portion of the holder have an adhesive layer on both sides and are bonded by an adhesive tape made of acrylic rubber containing glass mesh. Image display device. 3. A display panel comprising: a first substrate on which a plurality of discharge electrodes substantially parallel to each other are formed on one main surface; and a dielectric thin plate disposed at a predetermined interval on the first substrate. The gap between the substrate and the dielectric thin plate is filled with an ionizable gas,
A plasma cell is formed by sealing the periphery with a seal portion, and a second substrate having an electrode substantially orthogonal to the discharge electrode formed on the dielectric thin plate on the facing surface is overlapped with a liquid crystal layer therebetween. The image display device according to claim 1, wherein the image display device is configured by performing the following. 4. The display panel according to claim 3, wherein a sealing tube for sealing an ionizable gas is formed in the display panel, and a corresponding hole is formed in a concave portion of the holder. Image display device.